Benjamin a



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TO ALL WHOM IT MAYv CONCERN: Y Y

Be itvknown-that 1, BENJAMIN A. MASON, of the'city, and State ofNew Yorlqhnve invented, made, and applied to use, a certain' new and useful Improvement in Machinery foi-.Threading Metallic Screws; and I lo hereby declare the following to he a full, clear, and exact 'description of lthe said invention, reference being had to the annexed drawing, making part of this specilication, wherein- V Figure 1 is a general elevation o f the machine. I

Figure 2 is avertical section of the same. i

Figure 3 is va 'plan of parts below the-'line ,"c.

'Figure 4 is a plan of parts below the line y.

Figure iis a plan of the frame'and gearing helowthc line 21; and 'Figure (i is asimilar view below the line z2.

The-other figures are separately referred to, and similar inurl-:s of reference denote the same parts.

Y My machincis for cutting the thread upon a metallic blank-'to forma screw. To etl'ect this the headed blank is supplied automatically from a slide into a chuck and rotated by a driver while being operated upon by cutters. There are several of these chucks arrangedjn a 'circle around a head block, and the feeding mechanism is moved successively from one to the other;v and I employ a delivery mechanism that' acts in advance of. the feeding mechanism to takev the finished screw out of the, chuek .sothatthe said chuck may at the next mment receive a blank. I arrange a series of cutters around upon acirc'ular tool-carrier that is moved progressively from one screw blank to the ne'xt, and during thepajas'e between the movements, the said tool-carrier. is lowered bodily ata speed proportioned to the revolution ofthe screwblanks, so that the cutters takeotl', successively, a' shaving from theserew-hlank, each' one cuttingv deeper than-its predecessor, until the thread is completely cut and the finished screw is delivered; hence, after thc'machi'ne is lled with screw blanks, tliere is one screwcomblanks being in progressive stag-es' of completion.

In the drawing, A is a frame of suitable strength tocarry the parts.- a is the hed of the mach1ue,with a pleted and 'delivered each movement of the mechanism, 'and a blank deposited in the machine, the other screw `circular edge, a', seen also in ,the detached plan, lig. 9. `b is a column, bolted fast at its lower end to the bed a,

and formed at its uppeend as a holloiv'circular head-block, c, (se'e`detached views, figs. 15 and 16.) Around' the periphcry'lof this head-hloekvare grooves, in which the screw blanks hang whilcbeiiig rotated and out. The upper edge of this head-block projects as a ange, in-which are 'recesses receiving the chucks 11 (see iig. 18) for the screw blanks to hang in, an'd said chucks, revolving with the screw blanks, keep them much incre accurately in place, and prevent the wear which would arise from the screw head itself revolving in and .against the sidesl of a socket. The chucks 11 are kept in place by a ring cap, seen in gs. 1, 2, and 4, and in dotted lines in iig. 18, the same being screwed down uponV the surface of ,the head cz Above, and attached rmly to the head c,

rises the hollow column d, formed at the upper end as a table, e,`for thegears that rotate the Screwdrivers. e

is a central shaft,passing through thecolumns and d, and'having at its lower end the gear 1, that receives motion from the mitre-wheelf upon the shaft 2, having a pinion, 3, driven by the wheel' 4, (see iig. 6,) that gears into the wheel g upon a. shaft, 52, (see lig. 5,) which is driven-by the-pinion g that is on a shaft actuated by any suitable motor to impart motion to the whole machine. .Upon the upper end of the shaft e is u. central gear, 7L, rotating the series-of intermediate gearsyz', that in turn revolvothc gears k and screw-drivers l. The'gears c are formed as sleeves passing through the table c, and at their lower ends ring-plates are attached, as seen in figs. 2 and 17, to prevent the gears rising from' the table e, as the screw-drivers l are given an endwise movement through the said gears, and the screw-drivers have each. alongitndi'nal-slot taking a screw or pin, (iig. 17,) so that rotation shall he given by' the gears k--to the screw-drivers, but the latter-can be moved endwise .by the cam-ring m (figs. 1, 2, and 14) that surrounds the lower portion of thetablc c, and is sustained yby rollers 5, and is rotated as hereafter described. This ring m has a cani-groove 16, that receives rollers at. the lower 'ends of the lifting rods o 'that act upon lcvers,o, which are attached at their outer ends by links, and swivels to the yupper end ofthe scrmviliivers l. The-cam-groove 16 and .connections lift tbc screw-drivers up successively while a finished screw is being taken out of one of theohucks 11, and a blank placed in the chuck from which the finished screw had been previously removed`;- then the camgroove 16 lowers the serewv-drivetfdbwnupoxbthe screw head, and said screw-driver, being formed slightly rounding at the corners, or convex, and rotating, enters the nick in the head of the blank without ,marring said head, and the screwdriver is held down firmly to said .head by the action of the said cam 16. The edges of the screw-drivers heretofore usually employed are square, and hence they do not always freely enter the nick in the screw head,vbut naar said head when operated by a positive motion; but by having thc end slightly convex, the driver enters the nick without any risk of marring the head. The screw blanks headed, nicked, shaved, and formed with a tapering point, are fed `into the machined by being supplied into the inclined slide 8, :itv the bottom of which is a block extending as-an.. arm, 10, fromdthe column ,6 that hangs from the edge of the ring m, and said arm 10 has aiholc at its end, the size of the screw head, and a notch in its side suihcient to pass the shaft of the blank. n is a circular too1-carrier moved around progressively, as hereafter described, and having also an up-and-down movement. Upon this carrier 'n' are columns, n, with a crosshead piece, through which the column 6 passes, and the lower end of this column 6 is hollow, receiving a stud, T, on the carrier nfl By this construction the carrier 'it' and parts connected, including v the cam-ring m, are moved around, so that the block l0 pauses over each of the chucks 11 successively, and the rise and fall movement of the saidrcarrier n operates through the columns u and links 15vupon a slide, 19., that has at one end a. shank retainer, 14, and at the other end a head retainer, 13. The-retailicr 13, sliding over the hole in 10, 'prevents the head from passing down, and the retainer 14, sliding between the Shanks of the first and second blanks, keeps those in the ways 8 from sliding down, and the moving of 13 back atthe same time towards the axis of the machine, allows the one blank to drop into its chuck through the hole in 10Q The retainer 13 has a pin attached Vto it that projects sidewisc into the hole at the end of the arm 10, sothat the shank of the blank may hang against this pin and thereby remain in a vertical position, so as to fall correctly into the chuck 11 when the said retainer 13 and its pin are-moved back, as aforesaid. The tool-carrier n is supported upon a circular bed, q, the two being connected by plates 20, on the edges of q,entering a groove Iaround the lower part of the carrier n', (sec'iig. 10, plan of bed g, iig. 13, sideview of carrier n, also iig. 2.) The hed q has given to it. a rise and fall movement,` and the carrier 'n' a .progressively rotary movement upon the-bed g. To raise Aand lower-the bed g, and with it the carrier n', I employ the cams p p on the shaft 52'l acting upon rollers i7 in the Vcam-boxes p that are guided by rods 18 at their'lower ends, passing into holes in the cross=piecc of the frame, and from the upper ends ofprods 19 pass through the bed a, and lareattached to the bed q'. The shape of the cams p is such that the-tool-carrier n' ivill be loivered regularly the' pitch of .the screwthread each revolution of the screw blank, the gearing being proportioned accordingly, so that the cutters- "it carried bvsaid rin n', shall act to form the screw-thread u on thc blanks and cach cutter, t, is brouvht a g P a round in succession and cuts deeper to take off a shaving until thc screw is completed. This presentation ofthe cuttersto the screu blanks is effected by thc progressive rotation of the carrier 'n' bythe pawl r, (sec figs. 2, 4 7, and 8f) This paul -r is upon a vertical bar, r, passing through a carriage, s, set to slide in nays below the bed a, and this carriage s is moved by a bent lever, s', on afulcrum, 25, with a roller, 2T, kept against the-factcams 28 :'29 ou the u'heel g hy the spring 26, which' also draws back the paw] 1'. In the side of the bar i" is a notch, receiving the plate 24 that is bolted at one side of bed q, so that as said bed -is raised or lowered, as aforesaid, tue bar r my be slid up or down through the carriages, and thereby the pawl r be keptin position to not upon the ratchet teeth around the edge of thc carrier n', whether in a raised or lowered position. The shape of the face-cam 28 29 is such that after the carrier 'n' has descended, andthe tools t cut thevthreads upon the screw blanks, the com 29,' acting upon the pawl r through theniediuln of the levers', gives a partiulrotution to tho carrier n', and in this position the carrier n( is raised by the cams p,- then the cam 28, coming into action, completes the movement of the pawl r and the turning ofthe bed, so as tobring the `cutters -around to the next screw blanks, and they then are lowered and cut as before named. In order to hold the tool-carrier n steady` while descending and cutting the screw blanks, I make usc of the springsliding bolt` 21, passing through the bed q and entering holes in the lower edge of the tool-carrier n', (see inverted plan, g. 11.) This bolt is withdrawn previous to commencing each progressive rotation of the bed n by the bent lever 22, acted upon by the stud 23 on the wheel g. Each cutterz. is formed of a disk of steel, turned truewith the edge, of the same sectional shape as the screu'thread, and a notch is ground yin the edge of said disk, (see fig. 24,) to produce u' cutting edge. Cutters made in this manner do not require any adjustment, and when the cutting edge wears dull, it is only necessary to grind'o the radial face', andto turn the cutter upon its central bolt sudcient to bring the cutting edge on the line of the centre of the sliding stocks t', which stand on the carrier n', in' a radial position, (see tlg. 4.) IEach cutter stock t is arranged ysolas to slide upon the carrier n', and the cutters and I stocks are drawn away from the screw blanks by springs 30. u' are guide blocks, fastened upon the rim a of the bed o, and correspond in number with the chucks 11, and each one is placed on -a radial line, passing from the centre of the machine through the corresponding chuck 11. In vertical mortises in the inner ends of the block lul place the tool guides il., the inner faces of which correspond in shape with the screw to be cut, and they are all accuratelyplaced at the same distance from the centi-e of the machine; and 32 are adjusting screws,

and 3l are rollers ou the outer ends of the cutter stocks t', taking against the faces of the tool guides u, and

moving the cutter inwards as the carrier n. descends. The progression of the carrier n is iu the direct-ion shown oy the arrow, tig. el, and hence the cutter i, that follows around, behind, and nextto the arm 10, makes the first cut, and as the cutters are brought around successively, they cach cut deeper until the screw is finished. The depth of each cut is recruluted by thc sizetherollcrs 31, they being of regular increasing szo'from the first to the last. l y

By this constructiom'thc parts are adapted to cutting varying sizes of screws. By'changing the tool guide u, the shape of the point can be varied; by adjusting theseblocks u. by the screws 32, larger or smaller- ,sized screws can .he cut, the chucks l1 being changed to suit the sizeof wire and head, and by 'changing the `cams p the number of threads to the inch can be clmnged,"n.nd the machine adapted to longer or shorter screws within the given range ot' the. machine. -In order to deliver the screws, when finished, from the machine, I make use ofa raiser, 34, on an arm, v, that extends from the column (see figs. Z0 and 21,) and 35 is a. spring toe on an arm from the column n, which, taking the outerend of the raiser as 4the column n descends, causes the inner end of 34 to force up thel finished screw hetweentwo springfjaws-on a lifter, v', (see figs. 19 and 20,) which yield as the-screw head passes through between them. rlhis lifter eis'nn an axis, 135, with 'an arm, 36, (see fig. 2,) to which is connected alink, 3T, from the cross-bar between the column n, so that aft-er the screw head passes through between thc spring jaws, the lifter 'v' is swung over, and the screw droppedout upon a delivery chute, 40. In order to' hold the lit'ter' v down while the screw is lbeingi'orcerl up between its spring jaws, I employ a bolt, a', figs. 2,0 and 23,A which is moved in and out by a loubleneting wedge, 38, (see figs. 20 and 22,) which is attached to n', and in moving Vup and down therewith slides, the bolt a.' at the proper time, eitherto hold down the lifrer'a, or allow it to be swung up and over. The head block c is made hollow at 'el/,liga '2 and 16,.and is supplied with water or other liquid by a pipo,`89, and the liquid passes out in' jets at the inner sides of thc grooves in which the screw blanks revolve, so 'as to lubricnte the blanks and cutters. The chips andpliquid fall into the chamber formed above the bedg, aud inside the tool-carrier n; and a scraper, y, figs. 11 and 12, causes the saidl chips andliquid to be conveyed around to a delivery pipe, f4. What I claim, anddesire to secure by Letters Patent, is-

' 1. The arrangement of the slide 12, inclined ways- 3, and retainers 1.3 and 14 to supply the blanksone at a"time,'to the machine, substantially :xs-set forth.

2. I claim the arrangement of mechanism for actuating the screw-driversjl, consisting in the revolving camring m, rods o, levers o', and shackles, in combination with the sleeve gears lc, for rotating said'screw-drivers, as

set forth.

` 3. I claim the chucks 11 for holding the bl'anks, in combination vwith the screw-drivers, for revolving` such blanks, and the cutters for formingthe thread, as set forth. i

I 4; Ilclaim a series of screw-drivers and screw blank holders, arranged in a cireular'position, in combination with a series of cutters, moved around outside the screw blanks, 4and acting to cut the thread on such blanks by progressive cuts, the cutters being caused to move lengthwise ot' the screw blanks, and then pass tothe next screws, substantially as set forth.

5. I claim the tool guides u, supported by the blocks zo', and adjusted by the screws in combination'with the sliding cntter stocks t and cutters t, substantially as set forth.

G. I claim, in a screw-cutting machine, a series of cutters t, formed as specied, andsttached to the stocks t', in Vcombination with the series of rollers 31, of gradually-increasing size, as and for the-purposes specified.

.7. I claim the pawl r, carriage s, and plate 24, in combination with the tool-carrier n' and bed q, for the I purposes 'and substantially as set forth. v

S. I claim the bed g, toolsand carrier n', and cams p p, in combination witlfmechanism, substantially as set forth, 'for rotating the screw'blanks, whereby the screw-threads are formed by the descent of the carrier n', with a speed proportioned tothe rotation ot' the screw blanks. g v l v 9. I claim the bolt 21 and'ractuating lever 22, in combination with the pawl r, lever s, andt-ool-carrier fn', arranged and operating substantially as and for the purposes specied. I

10. I claim the raiser 34 and lifting jaws 1:',itted and-actuated substantially as and for the purposes specied. Y 7

11. I claim the tool-carrier n', to which a progressive rotary movement is imparted, in combination with the bed g, to which a rising and falling movement is given, substantially as set forth, Vso that the tools may have imparted to them a movement parallel with the axis of rotation, as well as a progressive rotary movement, as specified. l i f 12. ii claim the head block c', formed with 'a cavity, w, for water or other liquid, and from which jets pass to the screw blanks, as specified. i p I In witness whereof I have hereunto set my signature this tenth day of October, A. D. 18,66.

BENJ. -A.- MAsoN.

Witnesses:

Tno's. Grno.Y HAROLD,l l Gno. D. WALKER. 

